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While most perovskite X\u2010ray detectors typically rely on external bias for charge collection, the growing demand for efficient and energy\u2010saving perovskite X\u2010ray detectors has spurred extensive interest in self\u2010powered devices, which offer high\u2010performance, low power consumption, and enhanced portability. To date, most high\u2010performance self\u2010powered X\u2010ray detectors rely on secondary crystal growth via post\u2010deposition immersion in saturated solutions. Herein, we report a facile additive engineering strategy employing 4\u2010trifluoromethyphenylammonium iodide (CF\n                    <jats:sub>3<\/jats:sub>\n                    PhAI) to modulate perovskite crystallization, enabling single\u2010step fabrication of microcrystalline CsPbBr\n                    <jats:sub>3<\/jats:sub>\n                    films with grain sizes up to 38.6\u00a0\u00b5m. This approach effectively passivates defects and suppresses ion migration in CsPbBr\n                    <jats:sub>3<\/jats:sub>\n                    , reducing dark current drift by nearly two orders of magnitude from 4.135 \u00d7 10\n                    <jats:sup>\u221212<\/jats:sup>\n                    to 4.167 \u00d7 10\n                    <jats:sup>\u221214<\/jats:sup>\n                    A s\n                    <jats:sup>\u22121<\/jats:sup>\n                    . Moreover, the incorporation of a low\u2010work\u2010function aluminum (Al) top electrode significantly enhances the built\u2010in electric field, yielding a remarkable zero\u2010bias sensitivity of 1.3 \u00d7 10\n                    <jats:sup>3<\/jats:sup>\n                    \u00b5C Gy\n                    <jats:sub>air<\/jats:sub>\n                    <jats:sup>\u22121<\/jats:sup>\n                    cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    . This work accelerates the development of high\u2010performance self\u2010powered perovskite X\u2010ray detectors toward practical applications.\n                  <\/jats:p>","DOI":"10.1002\/smll.73230","type":"journal-article","created":{"date-parts":[[2026,3,26]],"date-time":"2026-03-26T08:45:41Z","timestamp":1774514741000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Additive Engineering for Ambient Blade\u2010Coated CsPbBr\n                    <sub>3<\/sub>\n                    Films Enabling High\u2010Performance Self\u2010Powered X\u2010Ray Detection"],"prefix":"10.1002","volume":"22","author":[{"given":"Jiahui","family":"Chen","sequence":"first","affiliation":[{"name":"College of Materials Science and Engineering Fuzhou University  Fuzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xianglong","family":"Wei","sequence":"additional","affiliation":[{"name":"College of Materials Science and Engineering Fuzhou University  Fuzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Siyin","family":"Hu","sequence":"additional","affiliation":[{"name":"College of Materials Science and Engineering Fuzhou University  Fuzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianing","family":"He","sequence":"additional","affiliation":[{"name":"College of Chemistry Fuzhou University  Fuzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhenjie","family":"Huang","sequence":"additional","affiliation":[{"name":"College of Materials Science and Engineering Fuzhou University  Fuzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shan\u2010Ci","family":"Chen","sequence":"additional","affiliation":[{"name":"College of Materials Science and Engineering Fuzhou University  Fuzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2008-9674","authenticated-orcid":false,"given":"Mei\u2010Jin","family":"Lin","sequence":"additional","affiliation":[{"name":"College of Chemistry Fuzhou University  Fuzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5894-0909","authenticated-orcid":false,"given":"Huanghao","family":"Yang","sequence":"additional","affiliation":[{"name":"College of Chemistry Fuzhou University  Fuzhou P. R. China"},{"name":"New Cornerstone Science Laboratory MOE Key Laboratory for Analytical Science of Food Safety and Biology College of Chemistry Fuzhou University  Fuzhou P. R. 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